摘要
同步电动机具有效率高、功率因数可调、过载能力大、电磁转矩受电压影响小等优点,在不需调速的电力拖动系统中应用十分广泛。文中从同步电动机固有机械特性、水泵起动负载特性等出发,根据力矩平衡方程式及机电惯性时间常数表达式,建立了大型泵站同步电动机组起动动态历时数学模型。结合南水北调某泵站大型同步电动机起动现场试验,经分析数值计算结果与现场试验结果基本吻合,验证了大型泵机组起动动态历时数学模型的正确性。同时现场试验结果表明起动动态历时与负载大小有很大关系,负载越大,起动动态历时越长,研究成果对同步电动机设计及大型泵站主机组选型配套,确保南水北调大型泵站安全可靠运行具有重要理论指导意义。
The synchronal motor has many excellences such as high efficiency, adjustable power factor, good over-load capability, little influence of voltage for electromagnetic torque, etc. It is widely used in electric drag system which needs no timing. Setting out from inherent mechanical character of the synchronal motor, the load＇s character of water pump＇s start, and basing on moment balance equation and mechaelectronic inertia time constant expression, this paper based a mathematic model of synchronal motor group＇s starting dynamics duration. To combined with the locale test of large-scale synchronal motor in pump station of the South-North Water Diversion project and through analyzing, the result of calculation accorded with that of locale test. It validated the correctness of the mathematic model of synchronal motor group＇s starting dynamics duration. Simultaneity the result of locale test indicated starting dynamics duration has relation to the load＇s magnitude. The bigger the load is, the longer the starting dynamics duration is. The production have supervise significance on pump station design and lectotype of large-scale pump station motor group, ensuring the safety of South-North Water Diversion project＇s operation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2007年第18期13-17,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(50279045)~~水利部科技创新项目(SCXC2002-06)
关键词
大型泵站
同步电动机
全压起动
动态历时
数值计算
large-scale pump station
synchronal motor
full-voltage starting
dynamics duration
numeric computation
